Latch.



A. C. 0. BUCK.

LATCH.

n APPUCATION FILED JAN.. 25,197- i L2,939 Patented Mar. 27, 1917.

bll/ESES l( n www@ @TATF PATENT @FFQE .ALFRED C.. 0. BOOK, OF BROOKLYN,NEW YORK, ASSIGNOR TO THE YALE 8c TOWNE MANUFACTURING COMPANY, 0FSTANFORD, CQNNECTJIC'UT.Y

LATCH.

Specification of Letters Patent.

Patented Mar. 27, 1917.

To all whom it may concern:

Be it known that I, ALFRED C. O. BooK, a subject of the Emperor ofGermany, and a resident of Brooklyn, in the county of Kings and State ofNew York, have invented certain new and useful improvements in Latches;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to vimprovements. in latches, and particularlythose having double throw bolts, the object being to provide improvedmeans for holding the bolt in its single throw position, which means arereleased to permit of the full throw. of the bolt, by its contact withthe strike plate as the door approaches its closed position.

A further object is to provide improved means for locking the boltagainst retracting movement when in its single throw position.

A further object is to provide means operable from the inside of thedoor for deadlocking the bolt when in its single throw position, andindependent means for deadlocking the bolt in lits double throwposition, said latter means being operable to release the bolt by thebolt retracting means for the latter.

With these objects in view my invention consists in the parts andcombination of parts as will be more fully explained and pointed out inthe claims.

In the accompanying drawings, Figure 1 is a view in elevation of thelatch, the cover plate of the casing being removed and showing the boltin its single throw position; Fig. 2 is a similar view of the coverplate and strike plate or keeper; Fig. 3 is a view in elevation showingthe bolt in its double throw position; Fig. 4f is a view similar to Fig.1, showing the bolt deadlocked in its single throw position; Fig'. 5 isa view showing the bolt in its retracted position and the means forholding it retracted; Fig. 6 is a view of the bolt; Fig. 7 is a view inperspective of the bolt deadlocking mechanism, and Fig. 8 is a view insection showing the pivoted bolt holding lever holding the bolt in itssingle throw position.

The improvement is shown in connection with a latch the bolt of which 1sadapted to be actuated by a key at the outer yside of the door, and by aknob at the inner side, but l would have it understood that I do notconfine myself to the details of the mechanismshown, except the bolt andthe parts which coact therewith to produce the results hereinafterdescribed. 1 represents the latch casing open at its inner face only,and provided at one end with an opening for the passage of the bolt 2,and also for the reception of the pivoted lever 3, which is providedwith a spring 4f, the latter normally tending to hold said pivoted leverprojected beyond the end of the casing and in a position to engage thestrike plate keeper 5 as the door moves to its closed position.

rihe bolt 2 is provided at its rear end with a rearwardly and laterallyprojecting lug 6 formed integral therewith. The lug is iiush with oneface of the bolt, and rests and moves in contact with the inner face ofthe lock casing 1, and is in a position to be engaged by one side andthe free end of the rear arm of the pivoted lever 3.A

Projecting from the inner end. of the bolt 2, are the parallel rods orstems 7, each of which is provided at its 'rear end with a head 8projecting at both sides of the stem and engaged on one side by the rollback 9, on the knob stem 10, and on the other side by the roll back 11journaled in the removable cover plate 12 of the lock casing andactuated by a Yale & Towne key cylinder or other mechanism secured tothe door and connected in the usual manner with said 'roll back 411. Thetwo stems 7 are located centrally with relation to the thickness of thebolt and also to the casing 1, and pass through the cross bar 12 whichis supported at its ends against shoulders 13 formed on the side membersof the casing 1. rThe stems are encircled by the springs 14, which bearat their front ends against the rear end of the bolt, and at their rearends against the cross bar 12, and normally tend to hold the bolt in itsprojected position.

15 is the lever for deadlockingthe bolt in its double throw position.This lever is bell crank in shape, and is pivoted at its elbow by thescrew 16, to the lock casing 1. The front end of the long arm of thislever terminates near the front end of the casing, and in a position tobe moved by the spring to the real' Of the bolt when the latter isvFigs. 1, 4 and 5.

Y and forms a stop or dead lock for the same.

vThe notches 18 are located centrally in the roll backs, hence wheneither one is actuated by the knob or key, the side walls of the notchesact as cams, thus pushing the post laterally which turns the lever 15-on its fulorum and moves the free end of its long arm out of the pathof movement of the bolt, thus permitting the further or continuedturning movement of the roll back to retract the bolt in the usual andwell known manner.

The vlug 6 onV bolt 2, coacts with the pivoted boltrholding lever 3 forholding the bolt in its single throw position. This lever, as beforeexplained is provided with a spring 4, which tends to hold the outer endof the lever projected and in a position to engage the strike plate orkeeper 5. When the bolt is in its double throw position, as shown inFig. 3, the lug 6 rests under the inwardly projecting arm of the lever3, and as the bolt is pulled inwardly, by either the knobor key, Vthe,lug 6 will be moved rearwardly. As the bolt reaches its single throwposition the lug passes from under the lever 3 andthe latter is thenmoved by its spring into a position in front of the lug 6 and acts as astop, and holds the bolt in such position until released by the contactof the outer projecting end of the pivoted lever with the strike plateor keeper 5 during the closing movement of the door thus permitting thebolt, when the door is fully closed, to move forwardly to its doublethrow position, and when this positionv is reached, the front end of thelong arm of the deadlocking lever 15' passes behind and in the path of1nove ment of the bolt and deadlocks the same.

When the bolt is in its single throw position, Vthe front free end ofthe dead locking lever 15 bears against the side face of the bolt anddoes not oer any resistance to the inward movement of the bolt caused bycontact ofthe latter with the strike plate or keeper.

As the bolt is being pushed inwardly by its contact with the strikeplate, the pivoted bolt holding lever 3 also engages said strike plateand is turned'so as to carry its Vfree end out of the path of movementof the lug 6 on the bolt, so that when the door reaches Y its closedposition, the bolt will be free to move to its double throw positionwithout any opposition from the bolt holding lever, the latter beingheld away from and out of the path of the lug, by its contact with thestrike plate.

19 is a slide having a linger piece Q0 operable from the inner side ofthe door. This slide is provided with an inwardly projecting stud 21adapted to be moved in front of the lug 6, on the bolt for holding thebolt in its fully retracted position as shown in Fig. 5; hence by firstretracting the bolt by turning the knob, and then shifting the slidesuntil the stud thereon rests in front of lug o', the bolt will be heldretracted until released by shifting the slide to its other position. Ifdesired this slide may be moved, when the door is open, and the bolt insingle throw position, in rear of the lug as shown in Fig. 4 and thusprevent the bolt from being forced inwardly as it must be in order toclose and lock the door; or after thc door has been closed, the bolt maybe retracted by the knob or key to its single throw position, and thendeadlocked against retraction by the key, by shifting the slide intodeadlocking position in rear of the lug 6 as shown in Fig. 5.

It is evident that many slight changes might be resorted to in therelative arrangement of parts shown and described without departing fromthe spirit and scope of my invention. Hence I would have it understoodthat I do not wish to confine myself to the exact construction andarrangement of parts herein shown and described, but

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is

1. In a latch, the combination of a double throw bolt having a shoulderat one side, and a lever pivoted to the lock casing and adapted toengage the shoulder on the bolt for holding the latter in its singlethrow position, the said lever adapted to be turned on its pivot by itsengagement with the strike plate as the door is closed so as to releasethe bolt and permit it to move to its double throw position when thedoor reaches its closed position.

2. In a latch, the combination of a double throw bolt having a shoulderprojecting at one side thereof and a spring pressed lever pivoted to thelatch casing and adapted to engage the shoulder on the bolt for holdingthe latter in its single throw position, the said lever adapted to beturned on its pivot by its engagement with the strike plate as the dooris closed, so as to release the bolt and permit it to move to its doublethrow position when the door reaches its closed position.

3. In a latch, the combination of a double throw bolt, key mechanism foractuating the bolt from the outer side of the door, means for holdingthe bolt in its single throw position, and means for deadlocking it whenin such position,

4%. In a latch, the combination of a spring actuated bolt, means forretracting the same, a lever pivoted to the latch casing with one endnormally projecting to `engage the strike plate or keeper of the latch,a projection from the bolt adapted to be engaged by the inner end ofsaid lever whereby the bolt may be held in a partly retracted posi tionwhen the door is open and a lever for dead locking the bolt when thelatter is fully projected.

5. In a latch, the'combination of a spring actuated bolt, means forretracting the Same,

means for holding the bolt partly retracted, the said means beingengaged by the strike plate or keeper of the lock to release the bolt,and means for locking said bolt against retraction by the retractingmeans and also for holding it in its partly retracted posi tion.

In testimony whereof, I have signed this specication in the presence oftwo subscribing witnesses.

ALFRED C. O. BOCK.

Witnesses:

J. H. TOWNE, G. N. JACOBL Copies of thin patent may be obtained for iivecents each, by addressing the Commissioner of Patents, Washington, D. C.

